[Combobox] Add EnableClickToClose

[hml-coder]

Pull Request

📖 Description

Set EnableClickToClose to true to enable dismissing the FluentCombobox dropdown list by clicking the dropdown button.

🎫 Issues

Addresses an issue with the web components fluent-combobox where the dropdown list cannot be closed by clicking the arrow indicator.

👩‍💻 Reviewer Notes

📑 Test Plan

Tried to create a test but the shadowRoot was empty and I'm not sure how to pre-load the required JavaScript handlers into the tests.

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

⏭ Next Steps

[vnbaaij]

Looks good to me.

[rpodevns]

Same behavior in web compnents v3. Clicking the indicator does not close the Combobox.

https://web-components.fluentui.dev/?path=/docs/components-combobox--docs

[vnbaaij]

I've flagged this in the fluentui v3 repo